Referee's report by Hugh Longbourne Callendar, on a paper 'On the specific heat of, heat flow from, and other phenomena of, the working fluid in the cylinder of the internal combustion engine' by Dugald Clerk Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests clarifying and elucidating some of the results and methods for easier understanding. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 8 March 1906. [March 1906]